How to add driver to an input of a node in the Animation Nodes?
I do realize this topic is a few years old, but this is one of the first results that shows up on Google when you search for this issue... so perhaps this can help some passersby:
A gentleman named Kuldeep Singh posted a workaround a while back, which would involve (for example) adding the driver instead to an empty's transform channel and then using an &quot;Object &gt; Transforms Input&quot; node to feed that data into Animation Nodes. (Source: https://blender.community/c/graphicall/0hbbbc/)
His workaround may be purely academic for most situations, but perhaps there are niche applications where this might be practical. Hope this helps! Peace and God bless!